ELWECO,
INC -- POTENTIOMETERS, RESOLVERS,
LINEAR ANGLE POSITION Sensors, TILT Sensors, ---- All
these non-contacting magnetic angle measuring sensors
use the Hall Effect and have no rubbing parts to wear. Class 5 or
Class 7 ball-bearings are used in Ball Bearing Models and Anodized journals are used in
others.

THIS HOME PAGE is designed for engineers and
technical people who quickly want information. All of the HallpotŪ products are
identified then the specifications for each model or type can be selected in the first
column. You immediately can see the signal response and the pictures of the HallpotŪ
sensors.

Links to
Specifications

Response plots

Pictures

Model Numbers

Descriptions
and Comments

This column gives the NAME
of the type of HallpotŪ and the Specifications.

Click on Spec-XX.pdf to get a complete two page specification file

This column shows the
response of each type of HallpotŪ over its full 360 degree of operation or of lesser
calibrated angles of operation.

that shows special configurations made to fit the needs of many users.

Model Numbers are presented
here for the standard models of eash type of HallpotŪ.

The ( ) is used to describe specifications tailored to user requirements such as voltage
and range.

Here is a brief
description of the types of applications a user may have.

Some really tough places
these are used in are under pressure in ocean depths of 10,000 feet in driling rigs, in
corrosive crude oil transmission lines under pressures of 1200 psi, and in the messy
location under automibiles on test tracks.

Size 75 HallpotŪ Potentiometers are the
most commonly used configurations to control position of mechanical devices.

They use the feature that a sine wave is nearly linear over +/- 30 degrees of
rotation. This angle fits the requirements of a large number of systems. They are useful
over larger angles as shown in the response graphs.

The sin-cos hallpotŪ produces
both a sine and a cosine signal for CCW rotation. This enables decoding to be used to
accurately measure and control angle over 360 degrees. Arc tan decoding produces the most
temperature stable operation.

This is the Two-Pi linear angle
sensor that measures over a full 360 degrees. All contain amplifiers that permit stable
operation with various power supply voltage. They produce linear signals over a full 360
degrees.

This model eliminates the need for a lot of hardware that might be needed with
resolvers, differential transformers or other types of angle sensors.

BRIEF
HISTORY ---- hallpotŪ angle sensors for measuring rotational
angle were developed starting in 1979 by the engineer / owner of Elweco, Inc. This
technology is based on the principle discovered by Hall more than one hundred years
ago. Originally, they were designed to improve the reliability and safety of joysticks
used on electric wheelchairs. From this early application that required exceptional
reliability and safety considerations, they evolved as angle position sensors for
industrial and military equipment as a result of their reliability and repeatability.

APPLICATIONS
--- hallpotŪ angle sensors are designed and built to be used in
normal or severe environments where failure of the sensor must not occur. They are
intended to replace resistive potentiometers, RVDTs, resolvers, and other types of
rotation sensors. They may be filled with oil and used in high pressure or underwater
environments. Typical systems include control of throttles, airfoils, hydrofoils, cameras,
dancer loops, antennas, automobile suspensions, steering, weapons, valves, Automobile Test
Dummies, or in any system that requires accurate and reliable measurement of angular
rotation.

PERFORMANCE
FEATURES ---

All versions of hallpotŪ angle sensors
generate their signals by moving a magnet near a hall-effect sensor. Rotation of a
magnetic field generates an electrical output signal that is an accurately controlled
function of input angular position. There is no contact between the magnet and sensor such
that there are no unwanted wear functions to affect the signal. Expected operational life
is exceptionally long and depends only on the grade of bearings within the devices.

MECHANICAL
CONFIGURATIONS --- hallpotŪ angle sensors are
nearly identical to the mechanical configurations of existing devices such as servo-mount
and resistive potentiometers. This enables them to replace the existing devices without
redesign of the user's mounting configurations. Additionally, Elweco, Inc makes special
configurations to fit non-standard or unusual geometry of the user.